Zapco ST-4XP SQ III Amplifier

ST-4XP SQ III 4-Channel Class A/B Sound Quality Amplifier Overview & Key FeaturesThe ST-4XP SQ III is a high-performance 4-channel Class A/B amplifier designed for premium sound quality. It features Tiffany-style RCA connections, speaker-level inputs with auto turn-on, and precise tuning controls including gain, crossover, and bass boost. Housed in a new aluminum chassis, it’s built for reliable performance and clean installation. Features 4-Channel Full-Range Class A/B Design Panel-Mount Tiffany-Style RCA Inputs Speaker-Level Inputs with Auto Turn-On Variable Input Gain Control Variable Electronic Crossover Variable Bass Boost New Aluminum Housing for Enhanced Durability Technical Specifications Power Output @ 4Ω: 4 x 150W Power Output @ 2Ω: 4 x 250W Bridged Power @ 4Ω: 2 x 500W RMS THD @ Rated Power: < 0.1% Signal-to-Noise Ratio: > 95 dB Channel Separation: > 60 dB Frequency Response: 15 Hz – 30 kHz ±1 dB Input Sensitivity: 0.25V to 5V Net Dimensions: 160mm (W) x 58mm